from a single 5V supply, the LTC2391-16 supports a large
±4.096V fully differential input range, making it ideal for
high performance applications which require maximum
dynamic range. The LTC2391-16 achieves ±2LSB INL max,
no missing codes at 16-bits and 94dB SNR (typ).
The LTC2391-16 includes a precision internal reference
with a guaranteed 0.5% initial accuracy and a ±20ppm/°C
(max) temperature coefficient. Fast 250ksps throughput
with no cycle latency in both parallel and serial interface
modes makes the LTC2391-16 ideally suited for a wide
variety of high speed applications. An internal oscillator
sets the conversion time, easing external timing consider-
ations. The LTC2391-16 dissipates only 95mW at 250ksps,
while both nap and sleep power-down modes are provided
to further reduce power during inactive periods.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
250ksps Throughput Rate
±2LSB INL (Max)
Guaranteed 16-Bit No Missing Codes
94dB SNR (Typ) at f
IN
= 20kHz
Guaranteed Operation to 125°C
Single 5V Supply
1.8V to 5V I/O Voltages
95mW Power Dissipation
±4.096V Differential Input Range
Internal Reference (20ppm/°C Max)
No Pipeline Delay, No Cycle Latency
Parallel and Serial Interface
Internal Conversion Clock
48-Pin 7mm
×
7mm LQFP and QFN Packages
APPLICATIONs
n
n
n
n
n
n
Medical Imaging
High Speed Data Acquisition
Digital Signal Processing
Industrial Process Control
Instrumentation
ATE
TYPICAL APPLICATION
5V
10µF
ANALOG INPUT
0V TO 4.096V
0.1µF
AVP
249
IN
+
LTC2391-16
IN
–
VCM REFIN REFOUT
CNVST
PD RESET GND OGND
10µF
1µF
SAMPLE CLOCK
10µF
5V
0.1µF
DVP
1.8V TO 5V
0
4.7µF
OVP
–20
–40
AMPLITUDE (dBFS)
PARALLEL
OR
16 BIT
SERIAL
INTERFACE
SER/PAR
BYTESWAP
OB/2C
CS
RD
BUSY
239116 TA01
16k Point FFT f
S
= 250ksps,
f
IN
= 20kHz
SNR = 94dB
THD –103dB
SINAD = 93.5dB
SFDR = 104dB
–60
–80
–100
–120
–140
–160
–180
0
25
75
50
FREQUENCY (kHz)
100
125
LT6350
2200pF
249
SINGLE-ENDED-
TO-DIFFERENTIAL
DRIVER
239116 G08
239116f
LTC2391-16
AbsOLuTe mAxImum rATINgs
(Notes 1, 2)
Supply Voltage (V
AVP
, V
DVP
, V
OVP
) ..........................6.0V
Analog Input Voltage (Note 3)
IN
+
, IN
–
, REFIN,
CNVST
.. (GND – 0.3V) to (V
AVP
+ 0.3V)
Digital Input Voltage........ (GND – 0.3V) to (V
OVP
+ 0.3V)
Digital Output Voltage ..... (GND – 0.3V) to (V
OVP
+ 0.3V)
Power Dissipation ...............................................500mW
Operating Temperature Range
LTC2391C ................................................ 0°C to 70°C
LTC2391I.............................................. –40°C to 85°C
LTC2391H .......................................... –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIgurATION
48 GND
47 AVP
46 AVP
45 AVP
44 GND
43 IN
+
42 IN
–
41 GND
40 AVP
39 REFSENSE
38 REFIN
37 REFOUT
GND
AVP
AVP
AVP
GND
IN
+
IN
–
GND
AVP
REFSENSE
REFIN
REFOUT
36 VCM
35 GND
34
CNVST
33 PD
32 RESET
31
CS
30
RD
29 BUSY
28 D15
27 D14
26 D13
25 D12
GND 1
AVP 2
DVP 3
SER/PAR 4
GND 5
OB/2C 6
GND 7
BYTESWAP 8
D0 9
D1 10
D2 11
D3 12
48
47
46
45
44
43
42
41
40
39
38
37
TOP VIEW
TOP VIEW
GND 1
AVP 2
DVP 3
SER/PAR 4
GND 5
OB/2C 6
GND 7
BYTESWAP 8
D0 9
D1 10
D2 11
D3 12
49
GND
36
35
34
33
32
31
30
29
28
27
26
25
VCM
GND
CNVST
PD
RESET
CS
RD
BUSY
D15
D14
D13
D12
D4 13
D5 14
D6 15
D7 16
OGND 17
OVP 18
DVP 19
GND 20
D8 21
D9/SDIN 22
D10/SDOUT 23
D11/SCLK 24
UK PACKAGE
48-LEAD (7mm 7mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 29°C/W
EXPOSED PAD (PIN 49) IS GND, MUST BE SOLDERED TO PCB
LX PACKAGE
48-LEAD (7mm 7mm) PLASTIC LQFP
T
JMAX
= 125°C,
θ
JA
= 55°C/W
OrDer INFOrmATION
LEAD FREE FINISH
LTC2391CUK-16#PBF
LTC2391IUK-16#PBF
LEAD FREE FINISH
LTC2391CLX-16#PBF
LTC2391ILX-16#PBF
LTC2391HLX-16#PBF
TAPE AND REEL
LTC2391CUK-16#TRPBF
LTC2391IUK-16#TRPBF
TRAY
LTC2391CLX-16#PBF
LTC2391ILX-16#PBF
LTC2391HLX-16#PBF
PART MARKING*
LTC2391UK-16
LTC2391UK-16
PART MARKING*
LTC2391LX-16
LTC2391LX-16
LTC2391LX-16
PACKAGE DESCRIPTION
48-Lead 7mm
×
7mm Plastic QFN
48-Lead 7mm
×
7mm Plastic QFN
PACKAGE DESCRIPTION
48-Lead 7mm
×
7mm Plastic LQFP
48-Lead 7mm
×
7mm Plastic LQFP
48-Lead 7mm
×
7mm Plastic LQFP
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
239116f
D4 13
D5 14
D6 15
D7 16
OGND 17
OVP 18
DVP 19
GND 20
D8 21
D9/SDIN 22
D10/SDOUT 23
D11/SCLK 24
LTC2391-16
ANALOg INPuT
The
l
denotes the specifications which apply over the full operating temperature range, otherwise
specifications are at T
A
= 25°C. (Note 4)
PARAMETER
Absolute Input Range (IN
+
)
Absolute Input Range (IN
–
)
Input Differential Voltage Range
Common Mode Input Range
Analog Input Leakage Current
Analog Input Capacitance
Input Common Mode Rejection Ratio
Sample Mode
Hold Mode
SYMBOL
V
IN+
V
IN–
V
IN+
– V
IN–
V
CM
I
IN
C
IN
CMRR
CONDITIONS
(Note 5)
(Note 5)
V
IN
= V
IN+
– V
IN–
l
l
l
l
l
MIN
–0.05
–0.05
–V
REF
V
REF
/2 – 0.05
TYP
MAX
AVP
AVP
V
REF
UNITS
V
V
V
V
µA
pF
pF
dB
V
REF
/2
45
5
70
V
REF
/2 + 0.05
±1
CONverTer ChArACTerIsTICs
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 4)
SYMBOL
PARAMETER
Resolution
No Missing Codes
Transition Noise
INL
DNL
BZE
FSE
Integral Linearity Error
Differential Linearity Error
Bipolar Zero Error
Bipolar Zero Error Drift
Bipolar Full-Scale Error
Bipolar Full-Scale Error Drift
External Reference
Internal Reference (Note 7)
l
CONDITIONS
l
l
MIN
16
16
TYP
MAX
UNITS
Bits
Bits
0.3
(Note 6)
(Note 7)
l
l
l
LSB
RMS
2
1
7
LSB
LSB
LSB
ppm/°C
0.14
0.1
%
%
ppm/°C
–2
–1
–7
±1
1
±10
DYNAmIC ACCurACY
The
l
denotes the specifications which apply over the full operating temperature range,
otherwise specifications are at T
A
= 25°C. A
IN
= –1dBFS (Notes 4, 8)
SYMBOL
SINAD
SNR
THD
SFDR
PARAMETER
Signal-to-(Noise + Distortion) Ratio
Signal-to-Noise Ratio
Total Harmonic Distortion
Spurious-Free Dynamic Range
–3dB Input Bandwidth
Aperture Delay
Aperture Jitter
Transient Response
Full-Scale Step
CONDITIONS
f
IN
= 20kHz
f
IN
= 20kHz
f
IN
= 20kHz, First 5 Harmonics
f
IN
= 20kHz
l
l
l
MIN
90.5
91
TYP
93.5
94
–103
104
50
0.5
7
60
MAX
UNITS
dB
dB
–94
dB
dB
MHz
ns
ps
RMS
ns
239116f
LTC2391-16
INTerNAL reFereNCe ChArACTerIsTICs
The
l
denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 4)
PARAMETER
V
REF
Output Voltage
V
REF
Output Tempco
V
REF
Output Impedance
External Reference Voltage
REFIN Input Impedance
V
REF
Line Regulation
VCM Output Voltage
AVP = 4.75V to 5.25V
I
OUT
= 0
CONDITIONS
I
OUT
= 0
I
OUT
= 0 (I-, H-Grades) (Note 11)
–0.1mA ≤ I
OUT
≤ 0.1mA
2.5
l
MIN
4.076
TYP
4.096
±10
2.6
4.096
85
0.3
2.08
MAX
4.116
±20
AVP – 0.5
UNITS
V
ppm/°C
kΩ
V
kΩ
mV/V
V
DIgITAL INPuTs AND DIgITAL OuTPuTs
The
l
denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 4)
PARAMETER
High Level Input Voltage
Low Level Input Voltage
Digital Input Current
Digital Input Capacitance
High Level Output Voltage
Low Level Output Voltage
Hi-Z Output Leakage Current
Output Source Current
Output Sink Current
I
O
= –500µA
I
O
= 500µA
V
OUT
= 0V to OVP
V
OUT
= 0V
V
OUT
= OVP
l
l
l
SYMBOL
V
IH
V
IL
I
IN
C
IN
V
OH
V
OL
I
OZ
I
SOURCE
I
SINK
CONDITIONS
l
l
MIN
0.8 • OVP
TYP
MAX
0.5
UNITS
V
V
µA
pF
V
V
IN
= 0V to OVP
l
–10
5
OVP – 0.2
10
0.2
–10
–10
10
10
V
µA
mA
mA
POwer requIremeNTs
The
l
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 4)
PARAMETER
Supply Voltage
Supply Voltage
Supply Current
Power Down Mode
Power Dissipation
Power Down Mode
250ksps Sample Rate with Nap Mode
Conversion Done and All Digital Inputs Tied to OVP
250ksps Sample Rate with Nap Mode
Conversion Done and All Digital Inputs Tied to OVP
l
l
SYMBOL
V
AVP
, V
DVP
V
OVP
I
DD
P
D
CONDITIONS
l
MIN
4.75
1.71
TYP
5
19
35
95
175
MAX
5.25
5.25
25
250
125
1250
UNITS
V
V
mA
µA
mW
µW
239116f
LTC2391-16
TImINg ChArACTerIsTICs
SYMBOL
f
SMPL
t
CONV
t
ACQ
t
4
t
5
t
6
t
7
t
8
t
9
t
10
t
r
, t
f
t
11
t
12
t
13
t
14
t
15
t
16
t
17
t
18
PARAMETER
Sampling Frequency
Conversion Time
Acquisition Time
CNVST
Low Time
CNVST
High Time
CNVST↓
to BUSY Delay
RESET Pulse Width
SCLK Period
SCLK High Time
SCLK Low Time
SCLK Rise and Fall Times
SDIN Setup Time
SDIN Hold Time
SDOUT Delay After SCLK↑
SDOUT Delay After
CS↓
CS↓
to SCLK Setup Time
Data Valid to BUSY↓
Data Access Time after
RD↓
or BYTESWAP↑
Bus Relinquish Time
C
L
= 15pF
(Note 10)
l
l
l
l
l
l
l
l
The
l
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 4)
CONDITIONS
l
l
l
l
l
MIN
TYP
MAX
250
2500
1485
UNITS
ksps
ns
ns
ns
ns
20
250
15
5
12.5
4
4
1
2
1
2
20
1
10
10
8
8
C
L
= 15pF
(Note 9)
l
l
l
l
l
ns
ns
ns
ns
ns
µs
ns
ns
ns
ns
ns
ns
ns
ns
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
All voltage values are with respect to ground.
Note 3:
When these pin voltages are taken below ground or above
AVP DVP or OVP they will be clamped by internal diodes. This product can
,
,
handle input currents up to 100mA below ground or above AVP DVP or
,
OVP without latchup.
Note 4:
AVP = DVP = OVP = 5V, f
SMPL
= 250ksps, external reference equal
to 4.096V unless otherwise noted.
Note 5:
Recommended operating conditions.
Note 6:
Integral nonlinearity is defined as the deviation of a code from a
straight line passing through the actual endpoints of the transfer curve.
The deviation is measured from the center of the quantization band.
Note 7:
Bipolar zero error is the offset voltage measured from –0.5LSB
when the output code flickers between 0000 0000 0000 0000 and 1111
1111 1111 1111. Bipolar full-scale error is the worst-case of –FS or +FS
untrimmed deviation from ideal first and last code transitions and includes
the effect of offset error.
Note 8:
All specifications in dB are referred to a full-scale ±4.096V input
with a 4.096V reference voltage.
Note 9:
t
13
of 8ns maximum allows a shift clock frequency up to
2 • (t
13
+ t
SETUP
) for falling edge capture with 50% duty cycle and up to
80MHz for rising capture. t
SETUP
is the set-up time of the receiving logic.
Note 10:
Guaranteed by design.
Note 11:
Temperature coefficient is calculated by dividing the maximum
change in output voltage by the specified temperature range.
4V
0.5V
t
DELAY
4V
0.5V
t
DELAY
4V
0.5V
50%
t
WIDTH
50%
239116F01
Figure 1. Voltage Levels for Timing Specifications
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